Update version number and update documentation
* Add `CLASS` to supported alt-link patterns (#21)
* Add bootstrap command (#42)
* Support wildcards for alt-links (#43)
* Stash conflicting data during clone (#44)
* Offer bootstrap after successful clone (#45)
* Display supported configs for `yadm config` (#46)
* Add "curl-pipe" program to clone without installation (#48)
* Fix bug in alt-link regular expressions (#49)